Computer shut off mid-game and now won't power back on

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andyps

Commendable
Sep 27, 2016
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Hi everyone. I was playing a game last night when my computer shutoff suddenly mid-game. I built this machine two weeks ago and it has been running perfectly since then. I built this as a Hackintosh, but I was gaming in Windows 10 when this happened.

Now when I try to power it on, the fans spin for a second and the water cooling pumps start briefly, then it all goes quiet. It won't do this again until I've turned off the PSU and turned it back on again. The red led near the CPU is also lit afterwards. When the power is on, all the motherboard lights on as per normal.

Based on a bunch of threads I've read, I thought it was a sudden PSU failure so I went and bought a new one today and exactly the same thing happens, so I'm ruling that out. Any ideas?

I7-5820K
Asus X99-A II
EVGA GTX 980 Ti Hybrid
Corsair RM850i

More detailed specs here: http://pcpartpicker.com/list/xmLPXH
 
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andyps

Commendable
Sep 27, 2016
5
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1,510


There isn't integrated graphic unfortunately. I have tried removing everything and it still has the same behavior with just the PSU + mobo + CPU. So either the mobo or CPU went bad?
 
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BadActor

BadActor

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Oct 31, 2015
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You need to try another graphics card in your system. A failed graphics card can sometimes cause the system not to boot. If it fails with a known good card, you still need to breadboard the system to be sure a short or peripheral isn't causing the problem before you needlessly spend money on something else. Try all sticks of RAM in individually in each slot to check for a defective RAM stick or slot. If all this doesn't identify the problem, then you probably need to RMA the motherboard since CPU's don't fail very often. Were you overclocking by chance? If you were, you also need to reset the Bios back to defaults.
 
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andyps

Commendable
Sep 27, 2016
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1,510


I swapped in another card from a working system. Same results. I tried the ram in different slots (each stick) with same results. So motherboard most likely? CPU less likely?

 
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amtseung

amtseung

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Jan 28, 2014
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Something extremely similar happened to me a little over a month ago. Exactly the same symptoms (system flashes life briefly, then dies, every time the power button is pressed). The end result after lots and lots of diagnostics and testing, was that my CPU's internal memory controller died with the motherboard. You most likely have a dead motherboard, but you might want to do some further testing to see if anything else died.

If you don't have a motherboard buzzer or speaker, get one. It'll help a lot.
 
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andyps

Commendable
Sep 27, 2016
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Ok I'll try a motherboard swap and see where that takes me. What causes sudden hardware failure like this? Or are there too many potential culprits?
 
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amtseung

amtseung

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Jan 28, 2014
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My issue, thanks to an autopsy done by the Intel warranty folks, was a microsurge, and my really tight RAM timings, which was already placing a great strain on the IMC, and the surge just finished it off.

There are so many potential points of failure, there's almost no point trying to find out what exactly is dead. That's what the professionals are for.
 
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